OPC-Classic-DAWrite node

Use the OPC-Classic-DAWrite node to change the value of a tag on your OPC Classic DA Server.

You can deploy the OPC-Classic-DAWrite node on Windows only.

The OPC-Classic-DAWrite node is contained within the Manufacturing drawer of the message flow palette, and is represented in the IBM® Integration Toolkit by the following image:

The OPC-Classic-DAWrite node is a mid-flow node.

The OPC-Classic-DAWrite node processes a TagData message that contains the address of an OPC Classic DA Server and a list of tags and values. The OPC-Classic-DAWrite node connects to the server and writes the specified values to the tags. The incoming message must be a DataObject domain message.

<NS1:TagData xmlns:NS1="com.ibm.manufacturing.tagData/v1.0">
 <ServerName>opcda://localhost/YourServer</ServerName>
 <Tag>
  <Name>ArrayOfString</Name>
  <Value>String1</Value>
  <Value>String2</Value>
  <Value>String3</Value>
  <Value>String4</Value>
 </Tag>
 <Tag>
  <Name>ArrayOfReal8</Name>
  <Value>6.94088287146E+3</Value>
  <Value>9.21019398201E+3</Value>
 </Tag>
 <Tag>
  <Name>Boolean</Name>
  <Value>false</Value>
 </Tag>
 <Tag>
  <Name>Int1</Name>
  <Value>99</Value>
 </Tag>
 <Tag>
  <Name>Int2</Name>
  <Value>11513</Value>
 </Tag>
 <Tag>
  <Name>Int4</Name>
  <Value>11921</Value>
 </Tag>
 <Tag>
  <Name>Money</Name>
  <Value>31919</Value>
 </Tag>
 <Tag>
  <Name>Qualities</Name>
  <Value>7828</Value>
 </Tag>
 <Tag>
  <Name>Real8</Name>
  <Value>1.111886036388E+4</Value>
 </Tag>
 <Tag>
  <Name>Real4</Name>
  <Value>5.9810869140625E+3</Value>
 </Tag>
 <Tag>
  <Name>Time</Name>
  <Value>2014-09-11T08:46:50</Value>
 </Tag>
 <Tag>
  <Name>UInt1</Name>
  <Value>248</Value>
 </Tag>
 <Tag>
  <Name>UInt2</Name>
  <Value>939</Value>
 </Tag>
 <Tag>
  <Name>UInt4</Name>
  <Value>25976</Value>
 </Tag>
 <Tag>
  <Name>String</Name>
  <Value>TEST_STRING</Value>
 </Tag>
</NS1:TagData> 

Multiple tags can be specified and array type tags can contain multiple values. For more information, see XML schema.

If the OPC-Classic-DAWrite node can connect to the server that is specified in the incoming message, the node outputs a message that contains the list of tags that are specified in the input message with the addition of a status code that indicates whether the write was successful.

If the server specified cannot be reached and the Failure terminal is connected, an exception is generated that is sent out of the Failure terminal. If the server specified cannot be reached and the Failure terminal is not connected, an exception is thrown back downstream.

The behavior of the OPC-Classic-DAWrite node is entirely controlled by the incoming message. Some node properties can be configured.

All mandatory properties for which you must enter a value (properties that do not have a default value defined) are marked with an asterisk in the user interface.

The following tables describe the node properties. The column headed M indicates whether the property is mandatory (a mandatory property is marked with an asterisk if you must enter a value when no default is defined); the column headed C indicates whether the property is configurable (you can change the value when you add the message flow to the broker archive (BAR) file to deploy it).